2 * twofishdata.c - Generates the permutations q0 and q1 for twofish.
3 * Copyright (C) 1999 Ruud de Rooij <ruud@debian.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
22 #define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
24 static unsigned char q0(unsigned char x)
26 static const unsigned char t0[16] = {
27 0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
28 0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4
30 static const unsigned char t1[16] = {
31 0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
32 0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD
34 static const unsigned char t2[16] = {
35 0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
36 0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1
38 static const unsigned char t3[16] = {
39 0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
40 0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA
43 unsigned char a0 = x / 16;
44 unsigned char b0 = x % 16;
46 unsigned char a1 = a0 ^ b0;
47 unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
49 unsigned char a2 = t0[a1];
50 unsigned char b2 = t1[b1];
52 unsigned char a3 = a2 ^ b2;
53 unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
55 unsigned char a4 = t2[a3];
56 unsigned char b4 = t3[b3];
58 unsigned char y = 16*b4 + a4;
63 static unsigned char q1(unsigned char x)
65 static const unsigned char t0[16] = {
66 0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
67 0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5
69 static const unsigned char t1[16] = {
70 0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
71 0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8
73 static const unsigned char t2[16] = {
74 0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
75 0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF
77 static const unsigned char t3[16] = {
78 0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
79 0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA
82 unsigned char a0 = x / 16;
83 unsigned char b0 = x % 16;
85 unsigned char a1 = a0 ^ b0;
86 unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
88 unsigned char a2 = t0[a1];
89 unsigned char b2 = t1[b1];
91 unsigned char a3 = a2 ^ b2;
92 unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
94 unsigned char a4 = t2[a3];
95 unsigned char b4 = t3[b3];
97 unsigned char y = 16*b4 + a4;
107 printf("static const uint8_t q0[256] = {");
108 for (i = 0; i < 256; i++) {
111 printf("0x%02X,", q0(i));
115 printf("static const uint8_t q1[256] = {");
116 for (i = 0; i < 256; i++) {
119 printf("0x%02X,", q1(i));